Spabk-pltjg



L. S. ROSS.

SPARK PLUG.

APPLICATION mzn JULY 12, 1919.

Patented Ma1'.2,1920.

VIZKW? R M M B m Od D Em b k a 10 I H N a a Inventor:

Leo 5. Ross KMW Witness:

LEO S. ROSS, OF CHICAGO, ILLINOIS.

SPARK-PLUG.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed July 17, 1919. Serial No. 311,452.

To all whom it may concern:

Be it known that I, LEO S. Ross, a citizen of the United States and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Spark-Phigs for Quick- Combustion Engines, of which the following is a specificatiom Among the objects of the invention is to obtain a spark lug by means of which a number of spar s or flashes are simultaneously obtained of considerable intensity relative to the voltage of the primary and generating current; to obtain a spark plug having few parts which are easily assembled and not liable to break or get out of order, a spark plug which is easily adjusted and not liable to be accidentally or wilfully put out of adjustment; and a spark plug which is economically made and durable.

In the accompanying drawing a construction is illustrated which embodies this invention and,

Figure 1 is a vertical sectional view of the assembled elements forming a spark plug.

Fig. 2 is a top plan view of the cap member of the spark plug and Fig. 3 a vertical sectional view thereof.

Fig. l is a side elevation of a cone tightening and adjusting member.

Fig. 5 is a top plan view of a connection member.

Fig. 6 a top plan view of a terminal memher, and Fig. 7 a top plan View of an insulating member. a

A reference letter applied to designate a given part indicates said part throughout the several figures of the drawing wherever the same appears.

A represents the main body or shell of the device which is of electric conducting material and provided with an annular flange (a) midway thereof, the external screw threads ((1') at one end and internal screw threads (a) at the other end thereof. The screw threads (a) are adapted to fit into corresponding screw threads in an aperture provided therefor communicating with the combustion chamber of an engine. The body part or shell (a) of the spark plug is provided with faces, indicated by reference character a, to which a wrench may be applied, as is common in spark plugs.

B represents a plug'of insulating material, preferalbly porcelain, which is provided with shoulder 12, adapted to abut against shoulder A of shell A, and C represents packing material interposed between said shoulders 7) and A Plug B is also provided with the additional shoulder Z) and with the longitudinally extending passageway b". The ends of plug B are provided with the flaring faces 72.

D represents a hollow nut which is provided with external screw threads corresponding with and fitting into the internal screw threads at of shell A. E represents packing material which is interposed between the shoulder b of plug B and the end of the hollow nut D. and said plug B is firmly secured in shell A by means of said hollow nut D in the usual manner.

F is a conductor which extends loosely through the longitudinal passageway b and is provided with screw threads f at the ends thereof. G, G, are nuts which are respectively provided with the conical face 9, the knurled periphery g and the screw thread aperture indicated by letters 9 in Fig. L.

The internal screw threads of apertures g, 9, correspond and fit the screw threads f, f, on the conductor F, and by means thereof the passageway b is closed at both ends. H represents a terminal having a plurality of teeth or points (it) on the periphery thereof and the aperture h therethrough. Terminal H is firmly attached to one end of the conductor B by turning said end of said conductor down to fit closely into aperture 71, and riveting, (as at h, Fig. 1) the end of said conductor over onto said terminal.

The adjustment of the points It relative to the end (I) of shell or case A is made, (in assembling the several parts of a spark plug and also at any time thereafter) by turning the screw threaded nut G which is adjacent to said terminal into proper position on conductor F relative to said terminal and thereafter turning the other one of said nuts G closely to place against the flaring face 6 at the other end of said plug, thus bringing the conical face of nuts G firmly against the flaring faces 6' and closing the passageway I) through said plug, as hereinbefore recited.

J represents a cap of insulating material,

both ends of said spark plug, to be bridged preferably porcelain, which fits over one end by a current of electricity flowing through of plug B. Cap J is provided withaperture j which fits loosely on conductor F, and when, said cap is in place on said plug, interference with the adjustment of terminalH, obtained by means of nuts G, G, as hereinbefore described, cannot be made. The upper face of cap J is provided with the annular which is provided with aperture is fitting over flange j.

' L represents a washer of insulatlng ma- -teria1 which is provided with aperture Z;

' fitting loosely over" conductor F, and M "represents a nutalso fitting over said con-- ductor F and provided with internal; screw threads corresponding with and fitting to the screw threads on said conductor.

The insulating washer L is interposed, as

illustrated in Fig. l,'between the conductor i K and the nut M so when said conductor is forced against J by the turnin'g'of nut to place said conductor G is insulated from said conductor F so that when an electrical current flowsfrom conductor N to "conductor K s'aidcurrent must jump from conductor K to nut M and from thence flow on conductor F to terminal H andagain I jump from point it thereof to end I of shell ductors supplied therefor.

" A double break in'the ignition current is A, from whence it flows to'the source of said current 1n the ordinary mannerover the conthus provided for, one thereof, from'termi- "'nalH in the fuel contained in the combusi -"tiOnchamberof the englne and one thereof from conductor K external to saidcombus *tion-ohamberj The length of the external break 'or jump is determined by the' thickimes {of the washer L. i

'I-claim: 1*."In asparkplug, a shell of conducting' i material, a'plug ofinsulating material pro- -vi'ded with-a passageway extending longi-' "t'udinally therethrouglu with the ends of -"--said*passageway flaring outwardly, means to '-'-seoure said plug in said shell, a screw threaded conductor in said passageway-extending beyond" the ends thereof, screw" threaded nuts on said conductor respectively provided with a'conical periphery fitti t :1

the flaring ends of said" passageway to close thesame, a terminal secured to one end of said conductor and adjacent to one end of" "saidshell, a cap of insulatmg material fitti'ng over the end of said plug, said cap" I providedwith an annular flange on the face I thereof, and provided'with an aperture fitting loosely around said screw threaded con said cap, all arranged to obtain gaps at --tudinally therethrough, with the ends of said passageway flaring outwardly, means to secure said plug in sald shell, a screw threaded conductor fitting loosely'in' said "passageway screw threaded nuts respectively provided with a conical periphery fitting in the flaringends of saidpa'ssageway to close the same, a terminalsecured to said conductor at one end ofrsaid' plug, a cap of insulating materiah fitting rover the other end of said plug and provided with an annular flange on theface thereof',: and

' provided with an aperture fitting loosely around said screw threaded conductor, a termlnalfittlng aroundsaid flange, and

' means to secure said terminal in place with insulating material interposed between said last named means and said terminal.

v iii-In a spark plug, the' combination of a shell of conducting material, a plug of insu- --lating'* material provided with a' passage way extending longitudinally therethrou'gh,

with the ends ofpassageway flaring outwardly, means to secure said plug insaid shell, a conductor provided with screw threadsat theends thereoffitting loosely in said passageway, a terminal secured on said conductor at one end thereof and a screw threaded nut on said conductor adj acent'to said terminal, said nut provided with a coni'cal periphery fitting to the flaring end of the passage wayin said plug, a nut provided with a' flaring periphery fitting to theilflaring end of said passage way at the other end ofs'aid plug-,insulating materialifitting over said ,other e'nd of said plug andaround said conductor, an additional terminal, additional insulating material on saida additional terminal, to insulate it front said conductor, and means to secure said! additional insulating material and -saidi additional terminal to-said first'n'ame'd insulating material and to force said last named nutwith the flaring'periphery' thereofto the flaring end of said plug to' close said passage way, said means to secure being made i of conducting material separated from said last named terminal by said additional insulating material.

ir-In 'aspark-plug, a-shell of'conducting material, a plug? of insulating material provided with a passageway extendingxlongitudinally therethrough, with the I ends 1; of said passageway flaring outwardly, means to secure said plug insaid shell, a screw threaded conductor in said-passageway and extending beyond-the ends 'of saidp'lug, screw threaded nuts respectively provided with a conical periphery fitting the flaring ends of said passageway to close the same, a said flange, and insulating material interterminal provided with a plurality of points posed between said terminal and said con- 10 secured on one end of said conductor, a cap ducting means.

of insulating material on said conductor,

said cap provided with an annular flange LEO ROSS and an additional terminal fitting said Witnesses: flange and including electric conducting CHARLES TURNER BROWN,

means to secure said last named terminal on J osm BECK. 

